Thread: face grove turning or other method?

I guess you could use a vertical mill and a rotary table. I don't have a mill so I would turn it. You just grind the tool to suit the job.

I would rough it out with a round nose tool , then finish it with a parting off tool . The tool you have drawn would work OK as well , but it might have a tendency to dig in with heavy cuts ..Doesn't look a very difficult job . MIKE PS Why not use a boring bar ?

The Trepanning tool would be you better option ,depending on the depth of the groove you could just use a solid piece of HSS upto about 1/2" 12mm,just grind the side clearance to suit the inner and outer diameters.
If you sharpen the cutting edges correctly you can use the one tool to do the whole opperation.

Originally Posted by morrisman

I would rough it out with a round nose tool , then finish it with a parting off tool . The tool you have drawn would work OK as well , but it might have a tendency to dig in with heavy cuts ..Doesn't look a very difficult job . MIKE PS Why not use a boring bar ?

Because a boring bar isn't usually designed for plunge cutting. And a parting tool isn't designed for curves. A trepanning tool is what is needed. It's like a parting tool but curved.

Being as lazy as I am when it comes to grinding tools I'd likely turn it out with some sort of boring bar. Turning the inside of the large diameter as per normal and turning the outside of the small diameter in reverse. Of course this wouldn't be all that fast but if its a one off and you have a cam-loc spindle, you could give it a go.

Stuart

What part of the job does the spindle concern.

HI PC,
I didnt think it was the done thing to turn in reverse with a threaded spindle(but then I dont have one so I wouldnt really know)

Stuart

As long a you werent stupid about it it is fine.
Never thought of doing this job in reverse,trepanning tool first thought and easiest,rather than boring,but just use the one bar with two tools.

Originally Posted by pipeclay

As long a you werent stupid about it it is fine.

Fair enough

Originally Posted by pipeclay

Never thought of doing this job in reverse,trepanning tool first thought and easiest,rather than boring,but just use the one bar with two tools.

Well you'd only be doing half of it in reverse. By using reverse instead of two tools you dont have to reset the tool depth.

But yes once you have a trepanning tool ot would go faster.

Stuart

Landslide, the tool you've drawn there is probably close to best for the job. While the idea of using a boring bar would work, boring bars that need a hole under 10mm are not common and looking at your drawing, the groove you want is 10 to 15mm wide. You haven't stated a depth but if we assume 10 to 15mm then you should be fine.
A parting tool would probably be too wide to cut properly - the OD of the recess is around 50mm so that takes us back to the trepanning style tool. I think what you've drawn is a good approximation to one.
The only comment I'd make is that because of the width of the tool you will need to feed slowly and keep speeds lower than normal so that you don't get too much chatter. Probably a series of plunges and then a finishing cut across to avoid too much side load on the tool. But then if you have thought about it enough to work out the right sort of tool, you've probably also thought about how best to use it too.

Michael

Going by the drawing it appears the depths are 3 and 20mm.